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chiharuhashibira · 2 months

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What about a shorts featuring your fave Kimetsu No Yaiba teacher?

But make it Professor X Student👀

Hey guys~ Like what I said on the last chapter, here is the second and final part!

Again, thank you for answering the poll we had before!

Anyways, let’s start!

𝓜𝓪𝓼𝓽𝓮𝓻𝓵𝓲𝓼𝓽

𝑺𝒑𝒆𝒄𝒊𝒂𝒍 𝑪𝒍𝒂𝒔𝒔𝒆𝒔: 𝑪𝒉𝒆𝒎𝒊𝒔𝒕𝒓𝒚

𝐊𝐲𝐨𝐣𝐮𝐫𝐨 𝐑𝐞𝐧𝐠𝐨𝐤𝐮 𝐕𝐞𝐫𝐬𝐢𝐨𝐧 | 𝐓𝐞𝐧𝐠𝐞𝐧 𝐔𝐳𝐮𝐢 𝐕𝐞𝐫𝐬𝐢𝐨𝐧 | 𝐆𝐢𝐲𝐮 𝐓𝐨𝐦𝐢𝐨𝐤𝐚 𝐕𝐞𝐫𝐬𝐢𝐨𝐧 | 𝐒𝐚𝐧𝐞𝐦𝐢 𝐒𝐡𝐢𝐧𝐚𝐳𝐮𝐠𝐚𝐰𝐚 𝐕𝐞𝐫𝐬𝐢𝐨𝐧 | 𝐎𝐛𝐚𝐧𝐚𝐢 𝐈𝐠𝐮𝐫𝐨 𝐕𝐞𝐫𝐬𝐢𝐨𝐧

<𝐏𝐫𝐞𝐯𝐢𝐨𝐮𝐬 𝐂𝐡𝐚𝐩𝐭𝐞𝐫

Content Warnings: ProfessorXStudent/Age Gap/Suggestive/Curse Words/Matured Content/18+/Sexually Explicit/Risky Sex/Mentions of Death/Angst/Tragedy

Minors DNI.

🌸𝑶𝒃𝒂𝒏𝒂𝒊 𝑰𝒈𝒖𝒓𝒐🌸

(Images are not mine, credits to the rightful owner)

��Then why didn’t you say anything?”

“What should I say then? ‘Hi, I’m Obanai, the boy from the foster home who also didn’t manage to save your sister from the fire. How are you?’”

His words offended you. But before you could leave the room, a cold hand wrapped around yours, pulling you back inside his lonely classroom. You turned to look at him, and there, the nonchalant facade that Obanai always had shattered.

Frustrations and regret masked his face as he held your hand tighter, not letting you go. And without wasting a second...

"Y/N, I didn't know how to tell you," he confessed, his voice thick with emotion. "I thought it was best to leave the past buried."

But you couldn't suppress all the reminiscence that came flashing in her head—the smell of burnt wood, the shouts of the children as they cried because their teachers were left inside, your sight blurred by your tears, and the agony the bad news had brought to you.

"You're here now, unscathed. So why didn't you save my sister?"

Your voice trembled with the weight of the accusation, and your eyes were brimming with unshed tears. You were lost for words as you felt your knees weaken. But then Obanai sighed for the nth time as he let go of you. Immediately, you felt the cold air wash away the remnants of what his hand had held earlier.

"I tried but I can't."

"No. I guess you didn't try at all."

Anger flickered in Obanai's eyes, and you clearly saw it. It was as if you've unlocked something dark in him. In that instant, you realised that you shouldn't have said that. You shouldn't blame him. But before you can take back what you've said, Obanai has already spoken up.

"Fine. Blame me. I won't say anything again because, I guess, you'll never listen to me."

"Sensei..."

"Go home. I've got lots of things to do. See you in class tomorrow."

The coldness of the breeze blanketed you as you watched how darkness seemingly swallowed Obanai's expression. You waited for a bit for him to say anything, but nothing came. So with tears running down your face, you ran outside his lonely classroom. Your heart heaved from the loss that felt like it might swallow you whole.

Days have passed since you've learned the truth. And yet, the air remained on your shoulder, bearing the unspoken tension between you and Obanai. Yes, you've cried for nights once again, as if Shinobu's death was just yesterday. The devastation was too hard to bear, but you know you can't back away from what you've started.

You know your sister won't be happy to see you like this forever. Despite the storm raging within you, you came back to your senses and faced Obanai in his classes as professionally as you could.

"So, Y/N-san, what's the answer?"

You blinked in surprise as the familiar voice called your name. You stood up from your seat and faced him with oozing confidence, which made Obanai's eyes widen.

"Yes, even at freezing temperatures, water can remain liquid."

It was the first time in a while that Obanai looked into your eyes. And there, you've no traces of that darkness that he had back on that afternoon. For a while, no one has responded, and both of you just looked into each other's eyes, seemingly longing to put closure on what happened. However, Obanai looked away and spoke up with a cold tone.

"Correct."

You sat back and watched as the professor explained. But of course, you couldn't help but feel so guilty about the things you told him. Looking at him now, you just want to apologise for letting your emotions get the best of you.

And perhaps you might need to do that before your guilt turns into unnecessary anger.

Now, you're face-to-face with Obanai in his empty classroom. Yes, the professor is well aware of your presence, but he refused to acknowledge it. Oh well, not until you stood in front of him and spoke up.

"Where's Kaburamaru? I haven't seen him."

Surprise almost ebbed out of Obanai. Little did you know, but the chemistry professor was dying to talk to you. He had been longing to fix things, as he was well aware of how jerky he acted back then.

You were lost and in despair with the sudden information that he had revealed. Of course, you would react that way. Especially when he had left so much of the information unsaid.

But of course, he is Obanai. He won't let that emotion show. So, he immediately composed himself and faced you without any expression.

"Why do you care? Classes are done. Why are you here? Stop pestering me."

His words made your eyebrows crease. He's colder than usual, and that makes you feel a bit vulnerable. He has all the right to be angry and avoid you after what you did. So you clenched your fist and swallowed your pride.

"Are we seriously going to ignore the elephant in the room?"

"As far as I know, we're done with this discussion—"

"I'm a bitch for blaming you. I didn't know what really happened back then. I just assumed things. I let myself be consumed by my overwhelming emotions. I know it's not an excuse for saying those words to you but sensei, I want to know what happened. And I'm so sorry."

"I'm busy, Y/N-san. Can't you see?"

You groaned, feeling that anytime soon you'd scream with frustration. Desperate to talk to him and knowing everything that happened in the past, you came up with an idea. You leaned in on his desk and spoke up in a low tone of voice.

"If you're so busy right now, meet me at 10 tonight. I'll wait for you in that same coffee shop, Obanai."

Before he can say anything again, you've turned your back and left. If what he said back there is true, if he really cares, then he'll come.

Clad in an off-shoulder blue top, a red skirt, and black rubber shoes, you found yourself fiddling with your hair as you waited unsurely for Obanai. You really can't blame him if he doesn't come at all, as, first and foremost, he is your chemistry professor. You're well aware that he shouldn't have these kinds of rendezvouses with his students.

Secondly, you've been a little shit for blaming him for the death of Shinobu and for making him feel guilty for surviving that tragedy. If you could just turn back time, you wouldn't have reacted that way.

Thirdly, it's possible that Obanai now despises you. You felt sick in the pit of your stomach at the notion of him hating you. Despite all the shit that has been happening, you can't hide the fact that you still like your professor.

His eyes—those rare heterochromatic eyes and his voice—can all send you to heaven, for all you care. Why hasn't it come to your mind that the boy before had those same beautiful eyes? So that's the reason why you have always found it so enigmatic.

But like before with science, you've messed things up again.

You felt hopeless as you looked at the time. It's past ten, almost eleven. And as if fate hated you, the owner sauntered towards you and told you that they'd be closing the shop.

Feeling embarrassed, you stood up and left, apologising for the bother.

And here you are now, standing in front of the closed coffee shop, as it started to thunder and drizzle. It's past eleven, almost twelve, and still, Obanai isn't here.

You felt your heart hurt in this situation. Tears started to fall on your cheek as you let all your frustrations get ahold of you. Of course, why would he show up?

Crouching down, rain started to pour, but you refused to leave, thinking that perhaps he'd come if you'd wait for a few more minutes.

But no, it's only two minutes before the clock strikes midnight, and yet, there's still no traces of Obanai Iguro.

Soaked in the rain, you covered your face as your sobs became louder. All you wanted to do was apologise and know what happened, and yet, it seems like it won't happen anymore.

"Y/N. Why are you here?"

Hearing that familiar voice, you felt your heart start to race. You looked up and there; those enigmatic heterochromatic eyes clashed with yours. Suddenly, you felt an arm wrapping around yours, pulling you under the protection of his umbrella.

Obanai groaned and took off his jacket, wrapping it over your shoulder.

"Why the fuck would you wait for me under the rain? You should've gone home, dimwit."

"I told you I'd wait."

"But why? Nothing will change Y/N."

"Because I want you to forgive me. Because I want to know what happened. Because I want you to... to be angry at me anymore."

"Whatever. I can't leave you like this. You're soaked to the bone. Ugh, fuck this, come with me."

Your eyes widened with his words. But you didn't complain or ask for more information. You let Obanai lead you to an apartment complex.

Yes, you didn't make any sound, even until he brought you inside his home.

"Sit there. I'll grab some towels and clothes."

Waiting for Obanai to come back from inside his bedroom felt like forever. So then, you looked around, observing his place. The apartment isn't big, but it isn't small either. It lacks colour, and yet the scent of lavender welcomed you. It's quite comforting, unlike your seemingly cold-hearted professor.

You let your eyes wander around as you shivered through your wet clothes. There are tonnes of books, and you assumed that all of those relate to chemistry. You started to wonder how many hours did he stay here to just read those. There's a lot so, what drove him to spend those time, just doing that?

And there on the corner was Kaburamaru, slithering inside his shelter.

But the thing that caught your attention was the picture on his study table. You stood up from your seat and sauntered towards it. You felt warm in your chest as the image registered in your senses.

There, you saw a glimpse of your sister's smiling face. Her beauty is immortalised in this image. And there beside her was a girl who wore braids. Memories of this girl braiding your hair like what you do to yourself came flashing in your head.

Mitsuri-san.

You looked at her little image beside Obanai, who had that small smile painted on his face. Yes, they look happy in this picture, and perhaps it was taken back when they were still volunteering for that foster home.

"What are you doing?"

Obanai's cold voice almost made you faint. You turned around, and there you saw him holding the towel and an oversized shirt.

"Nothing. I just saw a photo of the three of you."

"And who allowed you to go through my things?"

"Sorry, sensei. I was just curious."

"Whatever," Obanai said, then tossed you the towel and shirt. "Go get change. I already cleaned the bedroom so you can stay for the night. Don't worry, I'll sleep on the couch. I'll walk you home tomorrow when the storm calms down."

So, he'll let me stay? You thought as you gave him a faint smile, which made him look away. "Thank you, sensei."

After that encounter, you headed to his bedroom and looked around once again. The scent of lavender smells stronger here, but in a good way. Perhaps Obanai wants to calm himself so badly with this scent. It works well, though. Your anxiousness seemed to fade away.

His room is full of books too. But what surprised you again is the other photo on his bedside table. It was still the three of them. But here, Mitsuri was hugging him... He was smiling.

A pang of pain hit your chest as you decided to saunter quickly in the shower. Yet, even if you wanted to ignore the thought so badly while showering and even dressing, you couldn't help but wonder if he and Mitsuri were a thing before.

Possibly... They're close.

And she's nice; she probably won't say the things you told him before. Yes, Mitsuri is a great woman, just like your sister. It's just so sad that their lives ended before they could flourish for something more.

"You okay there, Y/N?"

You turned, and there you saw Obanai standing by the door, giving you a curious look.

You wanted to ask so badly, but you stopped yourself by biting your lip. But then, Obanai seems to notice. He sauntered inside his bedroom and placed the photo inside his drawer.

"I know you want to ask things. Ask now before I change my mind."

Obanai said as he took off his facemask and fixed his hair. You were astounded to see him without the facemask again. You can't still believe the fact that he's really that mysterious boy from the foster home.

"Sen—"

"Obanai."

"Oh, Obanai, are you and Mitsuri—"

"Almost."

Your face dropped; it seems like there are tonnes of secrets living inside this lad. For some reason, you wanted to know. He gave you this chance, so,

"Almost? What do you mean?"

"Mitsuri's the only girl who made me feel like a normal boy back in the foster home. But I never got the chance to tell her my feelings. I was about to confess when the fire happened."

"I'm sorry to hear that."

"It's okay. It's been too long and I've moved on. But honestly, when I first saw you in a braid back then at the coffee shop, you suddenly reminded me of her."

"Obanai..."

"But then it was just that time. Because you're really different from her."

"Of course. I'm not as nice as Mitsuri-san. Not as pretty as her either."

"Not that. You're... fuck it. You're nice and pretty... and smart, okay? Stop saying that. It's something else. It's more than your physical appearance."

"Then what? Do I remind you of my sister, instead? She raised me so—"

"Not that either. You remind me of... my younger self. Not Mitsuri or even your sister. You're like the young Obanai who hated everything for the pain the world has brought to him. The one who chose to use that loath to try to be in a better place. I'm not saying I am a hundred percent alright now. But it's just that I don't hate the world as much as I did back then. We got to celebrate little wins, right?"

His words crept into your senses and sent you a cold shiver. What does he mean? You felt like you were lost for words as you looked at Obanai and tried to analyse what you heard.

Suddenly, you felt his hands on your cheek again. There, you were sent to the first time he did this. It was when these revelations happened. So what will happen now?

Like a pack of wolves, your anxiousness started to prey on you. Your breathing slowed down, and you felt the tension in the air as Obanai leaned in to embrace you.

"I'm sorry that I made you wait. It was a jerk move."

Without words, you let yourself embrace him back, burying your face in his body. His apology sounded genuine, which made you feel a bit better.

Warmth suddenly flowed within you as you felt Obanai's hand caressing the back of your head, letting his cold fingers run through your locks. With that sensation, you weren't able to stop yourself from wanting him to stay.

"Can you stay here with me, Obanai?" You whispered, which made the man pull out from the embrace. "Why?"

"It's just... I want to know everything. I want to hear what happened."

You heard him sigh as he sat beside you. There, he looked nothing like the Obanai Iguro at the university. He looked nothing like your stern chemistry professor who is apparently allergic to women.

In this moment, he just looked like a normal guy, solid, warm but might be vulnerable. Just like how he looked back then when he was younger, but prettier.

"It's a long story."

"We have all night."

"Fine."

The night passed quickly, and yet you and Obanai didn't notice it.

He told you everything that happened back then, after the last time you'd seen him in that garden. Apparently, he was taken in by the Rengokus with Mitsuri.

He told you how Kyojuro and Mitsuri helped him come back to his senses. They are both reasons why he wanted to be a chemistry professor. It's a payback for how nice they were.

And yes, he had these little visits at the foster home by then, curious to see where the 'girl who weren't afraid of snakes' was. But you weren't there anymore, as you were taken in by the Kochos.

Time passed, and there he met with Shinobu once again as his co-worker. But back then, he had no idea that you were a part of her family. And yes, he didn't ask.

She seemed nice to Mitsuri and to him. But, of course, he didn't reciprocate well. He can't, as he was apparently 'allergic to women' or, more like, hated them, as his family, which is full of women, used to abuse him before.

He treated Shinobu as just a colleague, but never a friend.

But Mitsuri is an exemption as he grew with her. She proved to him that not all women are bad. And yes, he developed feelings for Mitsuri. But he can't reveal it, as he was too afraid. Not until it's too late.

Obanai told you that he was wrapping up his night classes back then when suddenly there was an explosion somewhere in the building. Afraid of what it might be and the consequences, Obanai ran towards it, and there he saw Mitsuri... dead.

It was too late to save her. He can't help but to wonder what if he just arrived a few moments earlier. Would his first love still be alive?

Obanai told you how it ebbed out all the remaining strength in his body. He just wanted to die.

But then he heard another voice from the room, and there he had a glimpse of an injured Shinobu, who was carrying a child. She ran towards him and told him to get the child out of the building, as she would try to look around to see if there were other children left.

And with the shock of seeing Mitsuri dead, he just followed Shinobu's orders and brought the child out to safety.

But then he realised that he shouldn't let his emotions get ahead of him, as there might be other children left inside. So then he ran back inside, and there he saw the weakened Shinobu under a fallen pillar. Obanai tried to save her, but then the girl refused and pointed towards a little girl who was crying on the corner.

She told him to save the child instead, despite all his complaints. He had no choice but to go to the little girl to save her as even if he tried every thing, there is no way that he can pull Shinobu out of the collapsed pillar. Besides, she was too injured.

"I didn't want to leave but Shinobu insisted. She told me that she would never sacrifice anyone for her sake."

Obanai paused to hold your hand as you started crying from what you are hearing right now.

"And there... your sister made me promise. She told me that if ever I see her youngest sister someday, I should do my best to bring her passion for science back. She told me that you were mad at her that day because she told you that she needed to leave for her science project at the foster home. She already knows that you'll hate science, as you might think that it is the reason why she'll die. But she never wanted you to feel that. It was no one's fault. Y/N, she loves you so much."

"Is that the reason why you gave me that notebook?"

"Yes... I always had that notebook because I always thought that perhaps someday I'd meet her sister. I actually prepared it for you in case what Shinobu said became true, and it did. I wanted to fulfill that promise so bad."

"I-I hated science because of what happened. My sister would've been alive by now if she didn't leave that night... But, perhaps that's really what we do if we love something?"

"She loves you more than anything Y/N. Always remember that. No one knew that the tragedy would happen..."

"Yes... I'm sorry for being so illogical Obanai. I am trying my best but... it still hurts a lot."

"No, it's okay. You didn't know. And you should take your time to heal yourself. There's no rush..."

"Thanks. But still... Why did you make this effort at all? Why did you want to fulfill that promise if my sister isn't important at all to you?"

"I don't know. I think it's how I dealt with the guilt of not saving those two—Mitsuri and Shinobu. I always thought that if I couldn't save them, perhaps I could help you? But I really didn't know if what I am doing right now helps you. Perhaps I should've buried—."

"Obanai, don't say that. You... you helped me a lot. And yes, I know you already made Mitsuri and my sister proud of this. And I can't thank you enough for these efforts that you've already made for someone whom you haven't met yet.."

Tears suddenly poured out of Obanai's eyes after hearing those words coming out of you. It's like the knife that has been stabbing him again and again all these years was suddenly pulled out, and there you are, trying to heal his wounds again.

You, on the other hand, realised what your sister's love could do. And you ended up crying too as you realised how wrong you were for telling Obanai that he never tried to save them. He did. He tried his best.

Seeing the strong Obanai breaking down made you feel more vulnerable, and suddenly, you felt the urge to slowly lean in and give him a passionate kiss.

Obanai was stunned. Never in his life has he experienced this. No one has ever looked at him this way after Mitsuri's death. But then, here you are now, kissing him passionately. He had tonnes of questions in mind. But then he shoved all of those and buried them deep within his mind as he let his hands slip around your body.

Warmth embraced the both of you as Obanai started kissing back, slowly pushing you down on the mattress. But then, before he got carried away, he pulled out, blushing so madly.

Drunk in passion and confusion, you opened your eyes, and there you saw Obanai trying to look away. So then, you sat and looked on your lap, feeling the regret of letting your passion take over.

"Sorry Obanai..."

"It's okay."

"I just wanted to... thank you, but I got carried away. I'm so sorry."

"Is that all that kiss was for? Just to thank me?"

His question made you think hard, because what would you answer? Is he expecting you to say yes or no? Confusion blinded you as you felt your hands start to shiver. It's just all too much for tonight.

Obanai noticed it, so he decided to drop the issue and speak up in a calmer tone. "I guess we can talk about this tomorrow. I'm sorry for scaring you again."

He was about to go when suddenly you pulled his hand again and said, "Stay with me, please."

Falling for that beautiful look you had now as you flaunt your vulnerability to him, Obanai can't do anything but agree. And there he stayed the night, lying beside you to caress your hair as you drifted into sleep.

Little did you know that as you slept, the man looked at you, thinking how he'd want to risk everything just to protect you. He touched your cheek and kissed your forehead. Obanai couldn't stop himself from taking in your wonderful image.

Questions are still in his head, especially about the reason behind that kiss. He felt his heart racing once again as he looked at you. He never wanted to be with anyone, but now he thinks he is starting to fall in love again.

All he knows right now is that he adores you, so he wanted to know you better.

Obanai stopped praying. He has never prayed since the night when he escaped his abusive family. But then this night, he prayed so hard that fate would let him be with you. He also prayed that Mitsuri and Shinobu wouldn't kill him for feeling this intense passion for you.

He wants nothing but to be there for you. Aside from protecting you, Obanai would want to risk everything to lift the burden inside of you, even just a little.

It's the least that he can do, as you gave him another chance in life and made him feel like a normal guy again. And for a while, it was peace that he felt right now as you slept on his arms.

Feeling a bit hazy, you opened your eyes, and there, the scene that you never expected to see welcomed you. Obanai was there, facing you as he slept quietly. His hand was wrapped around your body, making you blush hard. The man looked like it was the first time that he had slept this peacefully in years.

Seeing him like this ignited your passion, which made you want to caress his cheek. Suddenly, faint fragments of the night came into you, which in turn made you redder than you already are. You felt your body heat up as you remembered that you'd kissed this guy last night.

Yes, you kissed your chemistry professor.

It's insane, but you also remembered how you made him confused with the words that you'd told him after. Then it finally hit you... How can you face him at class so casually again after that night? Aside from those heavy revelations, there seems to be a deeper connection that is happening with both of you now.

So even if you still wanted to lay there and just stare at his wonderful face, you slowly lifted up his arms and crawled out of bed. You sneaked towards the window to see if the rain had gone away. It was all stormy last night, but then, it's good to know that the sun is shining brightly today.

You were about to head out of his bedroom, as you badly wanted to sneak out. You just don't know how to react in front of him after everything, and you want to just escape the possible awkward encounter.

But then, just before you could make another step out of his bedroom, Obanai's sleepy voice made you turn to look at him. "What time is it?" He asked as he rubbed his eyes with his hand and stretched his back.

Gulping before you spoke, you looked at the wall clock and spoke up with a trembling tone. "Seven in the morning. I have classes around nine. I should get going." Obanai perked up, realisation coming into his senses.

"Gosh, I almost forgot... I'll cook you breakfast. Wait."

Obanai stood up from the bed, making you bite your lip. As if his intrusive thoughts overtook him, he ruffled your hair before heading out of his bedroom.

Realising that you're all alone again, inside his bedroom, you felt your knees finally give out, and you fell to the ground. How can he act so casual about this? You thought as you blushed madly.

But then, you quickly got on your feet as you realised that even if you ran back to your house to change, you'd still be late. You walked quickly to the kitchen, and there, you saw Obanai making two omelettes.

Your heartbeat rushed as your eyes met. Obanai smiled at you, which almost made you melt. He looks nothing like yesterday. It's like all the grumpiness in him was suddenly gone.

"You hungry? I'll be finished cooking in a few minutes. If you want, you can take a shower now. I have some hoodies and pants that I think would fit you."

You blushed at the thought of you wearing his clothes to the university. "Won't people notice that I'm wearing your clothes?" You asked, fiddling with your fingers.

Obanai tilted his head to the side while looking at you. "Have you seen me wear hoodies at the university?"

"No."

"Then no. Go take a shower now."

You wanted to complain, but as if you were automated to do so, you headed to the bathroom and took a shower. It was surprising to see a lilac hoodie and black pants prepared for you at the bed.

A small smile crept onto your lips. You never expected that Obanai would be this caring. But then, you reminded yourself that perhaps he is just doing this because of his promise to your sister.

Sighing, you put on his clothes and fixed yourself. You know that you shouldn't bother yourself with these thoughts, so you tried shoving them deep within your head.

You went out of the bedroom and were astounded to see the delectable dish that the man had prepared for you.

Obanai appeared out of nowhere, from behind your back. "Y/N, I've already eaten. I'll just take a quick shower, and then we'll head to the university. There's a spare toothbrush that I've prepared there. Feel free to use my comb as well."

"Yes, sir," you said, blushing, and there, Obanai finally left again.

You could see how Kaburamaru stared at you in the corner of your eye. You smiled at him and then proceeded to finish your breakfast and fix yourself.

Obanai emerged from his bedroom, and yes, the lavender smell made you turn your head towards him. He was clad in his usual formal clothing and oversized lab coat again, with that face mask.

You suddenly wanted to tease him, and so you did.

"It looks like my grumpy sensei is back."

He facepalmed and sauntered towards you. You were astounded by the next actions that he took. Cornering you on the wall, Obanai pulled down his facemask and leaned in to kiss you.

A yelp escaped from your mouth, but then you found yourself leaning in to kiss him back. It seems like your vision was filled with fireworks as you felt warmth burning at the pit of your stomach.

Obanai suddenly pulled out, panting from the intense kiss. Before you could say anything, the chemistry professor finally spoke up. "I don't think I could just be your 'sensei' after last night. If you really just kissed me just to thank me, I'll do everything to change that. Y/N. I don't care anymore, but I want you to be mine."

Panting while trying to suppress all your moans, you found yourself skin-to-skin with your chemistry professor. Obanai covered your mouth as your nails dug into his back.

"Obanai... Mmmm, yes..."

"Sshh, if you'll not be quiet, someone might hear us."

Obanai bit you on your shoulder as he wildly thrusted his throbbing cock inside of you. Making your eyes roll back because of the sensation that he is giving you, a loud moan almost slipped out of your mouth. Thankfully, Obanai managed to cover your mouth before you could scream in pleasure.

But as the pleasure started to engulf you, you started to wonder. How did this happen?

Flashback:

Days have passed since Obanai's confession, and yet you still haven't told him about your real feelings. It's like, whenever you feel that you're ready, you'll end up swallowing the words back again.

So then, Obanai is still oblivious to your feelings. And when we say oblivious, it also means that it makes him more determined to court you. Yes, he is well aware that this could be wrong in the eyes of others. But then, he wanted nothing but to protect you and help you heal.

He wanted to fulfil his promise to Shinobu, but he also didn't want to commit the same mistakes that he had done to Mitsuri. He won't let things become too late before he makes a move.

At school hours, Obanai remained professional—and, of course, grumpy—to all of his students. You are not an exception to this. But then, after classes, the chemistry professor would pull you into an empty hall, away from prying eyes, just to give you your favourite snack or a flower.

Yes, he courted you like a gentleman. Even if it is behind the curtains of being acceptable to all, you can't help but fall for him more.

So then one day, when your curiosity took over, you directly told Obanai something that made him flabbergasted to the bone.

"Are you doing all of this because of the promise that you had with my sister? Because if you're just efforting for that, please just stay as my professor. I can't risk everything if I know I'll be in a situation wherein I'm going to lose more than myself."

Clicking his tongue, Obanai raised his eyebrow at you. "Here you go again with your assumptions," he said with a tone of dismay in his voice.

"I just want to be sure because, just to be clear, you don't have any responsibility for me. I'm a grown woman."

"And I'm well aware of that. I'm not stupid."

"You're not stupid, but I might be. So please just stop this if you're just doing it because of that promise or because I remind you of Mitsuri-san...."

"No. You're wrong. I'm doing this because I like you. Okay? You are good to me even if I was being an all-time jerk. You treated me like a normal guy. And it always feels like I've known you forever."

Hearing those words coming from his mouth, with the clear truth painted on his heterochromatic eyes, you felt your heart rise. And there, finally, you spoke the words that Obanai had been wanting to hear.

"I-I like you too, sensei."

"Y/N..."

Before you could reply, Obanai tugged off his facemask and snaked his arms around you, pulling you into a passionate kiss. There, you felt your knees weaken as you submitted to his strong arms. Never have you imagined in your life that the boy who saved you from being bit by Kaburamaru when you were younger would also be this man who ended up falling for you.

Taken by his emotions, Obanai slowly bit your lip, letting his hands slip under your shirt. Without caring that anyone could enter the room by now, you let his tongue slip inside your mouth, with the kiss only ending with the both of you fighting for dominance.

Heat crept up on your body as you felt his usual cold hands run on your body. With shivers running up your spine, you pulled out and looked into Obanai's eyes. Surprised by the passion painted on his marvellous orbs, you caressed his face and gave him a soft smile.

"I'm all yours, Obanai," you whispered before leaning in to kiss his lips.

Little did you know, your words flipped a switch on Obanai, giving him the strength to carry you to the table. Slowly, his lips went down on your jaw, planting ticklish kisses that went down on your collarbone. A soft moan escaped from your lips as you wrapped your hands around his neck.

That made the chemistry professor look up at you and caress your face. "I want you, Y/N." His words were vague, but you already know what he means. And yes, how could you resist those wonderful eyes and that fierce expression on his face? He was hungry for your touch.

You didn't answer; you spread your legs, inviting him to move closer to you. And there, Obanai gulped and positioned your body between your thighs. There, you slowly felt his hard member, cloaked under his pants, as he slowly grinded on you while kissing you deeply.

And there, another moan escaped your lips, which in turn made Obanai harder than he already is. "Oh, you make me want to fuck you so bad right now," he whispered in your ear, with a voice so sensual that it made you almost cum.

"I want you too, Obanai."

"Are you sure?" He asked as he ran his hands on your hair. You nodded, and there, a small smile managed to escape from his senses. Without saying a word, Obanai's hands worked up on your shirt, taking it off you. Slowly, he opened your bra, making you gasp as the sudden coldness of the room embraced you.

Slowly, Obanai removed his lab coat and shirt, making you gasp as you saw a burn mark on his chest. You touched it gently, making the man bite his lip.

You felt a pinch on your chest with what you saw. He must have gotten that burn mark back that night. So then, even if you knew it wouldn't heal it, you slowly planted kisses on it, making Obanai moan loudly.

Slowly, Obanai slipped his finger under your skirt, pulling your pants to the side. And there, he slowly ran his hands on your wet slit. "Fuck..." you mumbled as you buried your face on his bare chest, licking his scar down to his sensitive nipples.

Pain and pleasure embraced you as suddenly, Obanai slipped two of his fingers inside of you. "Fuck, so tight," he said as he laid you down on the table, spreading you open like a book. And there, his mouth worked on your nipples, nibbling and licking them as he continued to finger-fuck you with an unpredictable rhythm.

"I'm near," you whispered as he fingered you faster. But then, after hearing that, the man stopped and kissed your lips instead.

"I'm so hard right now..." He whispered, making you wetter than you already are. "Fuck me then." You said confidently, ignoring the fact that it'll be your first time if he does what you're suggesting.

"You sure? It'll be my—"

You were astounded by what he was going to say, but then you cut it off by saying, "It's mine too... And I want it to be you. Make love with me, Obanai." You said, making the man nod.

With your words, Obanai pulled down his pants, and there, his hardened cock surprised you. You spread your legs more as Obanai positioned his cock on your entrance, rubbing it against it to tease you.

Feeling impatient, you pulled him close to you and gave him a deep kiss as he slowly entered you. The pain that you felt eventually subsided as Obanai thrust himself in and out of you, whispering how he loved you.

You wrapped your legs around his waist, letting him go deeper into you. But then, just as before you could feel your climax, a knock stunned the both of you.

"Iguro-sensei? Are you here?"

Realising that the door wasn't locked, your heart thumped hard. "Fuck," Obanai groaned as he carried you from the table, still not pulling out. He kicked your clothes under the table as he commanded you to bend down under the table so that nobody could see you.

No one should see you in this state except him!

So there, you followed him and bent down under the table, with his cock still inside of you. Obanai put on his shirt and lab coat, draping them on you.

And there, your heart thumped harder. But the risk he is putting you in right now didn't stop you from feeling more aroused. He signalled for you to shut up, and there he spoke up with his usual uninterested voice, letting the student into his classroom.

"What do you want?"

"Sensei, you have no facemask," Nezuko said, surprised to see their professor like that for the first time.

"So? What do you need, idiot?"

The innocent Nezuko came in and spoke up. "Iguro-sensei, I just want to ask if you have seen Y/N. Our next class will start, but she still isn't around."

You felt a bit guilty for making your classmate worry, but then you knew that you couldn't just show up right now. Looking up, you saw Obanai flash you a 'you're dead' look that made you gulp. The professor hates it when students skip classes, and now you're skipping one to get fucked by him.

Obanai groaned at Nezuko. "Do I look like a babysitter? She's not here, can't you see? Go find her somewhere else. Perhaps she's out there slacking off or what, for all I care."

"Sorry sensei..."

"Go out and lock the door before closing it."

A few seconds after Nezuko left and locked the door, Obanai yanked you out of the table with your hair and bent you on the table.

"So, you're skipping classes now, huh? I'm going to fuck you so hard for this. Bad girl."

Obanai said, not letting you speak as he thrust deeper and harder into your wet pussy, making you moan loudly. He took off his remaining clothing again and yanked your hair harder as he grinded in his cock on your damped hole.

"Fuck, you feel so good."

End of flashback

"Obanai... Mmmm, yes..."

"Sshh, if you'll not be quiet, someone might hear us."

Obanai bit you on your shoulder as he slowly inserted his throbbing cock inside of you. Making your eyes roll back because of the sensation that he is giving you, a loud moan almost slipped out of your mouth. Thankfully, Obanai managed to cover your mouth before you could scream in pleasure.

With your orgasm building inside of you, you felt yourself tearing up. Obanai kissed your neck, groped your breasts, and played with your nipples as he fucked you hard.

"Fuck, I'm near..." He said, turning you over to face him now. There, he laid you on the floor, with your lustful and passionate eyes locked with each other. "I want to see your face as you cum." He said, and there, Obanai started slipping his cock in and out of you as his right hand worked to rub your clit.

With the overstimulation, you can't help but wrap your legs around him, pulling him down to kiss him deeply as you tear up with the sensation that you are feeling.

And there, as if atoms had collided, you felt an explosion inside of you as your sweet juices mixed with Obanai's cum. "Fuck!" He said as you bit his shoulder, letting the pleasure take over.

With his thrusts slowing down, Obanai collapsed over you, panting. You ran your hands on his hair and buried your face in the crook of his neck. Your heart is racing with the rhythm of his.

"I love you, Obanai."

"I love you too. You're mine."

"I'm yours."

You looked at the sky, letting the cold breeze caress your skin. Resting on your lap was Obanai, who was petting Kaburamaru.

You looked down on the chemistry professor, and realisation hit you again. This marvellous man is yours. Who would have thought that the boy you've met at the foster home would change your life?

And there, you realised that if Shinobu and Mitsuri could see the both of you now, perhaps they would be happy. You know how those girls wanted you and Obanai to be happy before, and now it happens because you found love with each other.

And it's true, Obanai had seen his old self in you, but now it's different.

Like he had said before, both of you are not a hundred percent alright right now. But it's just that you don't hate the world as much as you did back then. And yes, you have to celebrate little wins, right?

And now, celebrating will be better, as you will get to celebrate it with the one you love every day.

𝓣𝓱𝓪𝓷𝓴 𝔂𝓸𝓾 𝓯𝓸𝓻 𝓻𝓮𝓪𝓭𝓲𝓷𝓰 𝓽𝓱𝓲𝓼 𝓢𝓹𝓮𝓬𝓲𝓪𝓵 𝓒𝓵𝓪𝓼𝓼𝓮𝓼 𝓥𝓮𝓻𝓼𝓲𝓸𝓷!

Phew! All done with the Special Classes series finally! How has it been for you? XD I hope you enjoyed reading every single version!

It was quite hard writing Obanai's piece as it became deeper than I expected it to be (yes, I guess... he'll want it deep 🤭) But kidding aside! I enjoyed writing this as much as I wanted sleep hahahahaha!

Love yah all and thank you for the support as always! Feel free to reblog, request, and comment!

See you on the next series that I'm making (Tsugoku X Male Hashira and Oiran X Male Hashira) and the other one shots that I am preparing.

I'll be accommodating reqs as soon as my sched clears out UwU

Thank you again, minna-san!

MDNI!

Ja ne~

~𝓒𝓱𝓲𝓱𝓪𝓻𝓾-𝓬𝓱𝓪𝓷🌸

<𝐏𝐫𝐞𝐯𝐢𝐨𝐮𝐬 𝐂𝐡𝐚𝐩𝐭𝐞𝐫